what is important for seo in html code?

Question

Tell yourself to learn more about yourself.
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Just to learn.

Answer 1

SEO likes clear structure of web page. Very important is right use of semantic elements nav, header, main, aside, footer, section and article. Emphasize the important words with tags <strong> or <em> (If you do not like/need bold or italic style, use CSS to fix.). Emphasize only important words do not overdo. Content of your page should be relevant, seo rate this. Do not copy or steal content from other pages. Be unique and be relevant. Content of your page should be useful. All pictures should have attribute alt because seo can not see pictures but seo can read attribute alt. Also is important right use of tags h1 - h6.

Answer 2

semantic tags.
it's important for seo and search engine reading your site